package person.drf.shop.product.jucTest;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/*
*   多线程之间按顺序调用，实现A->B->C
*   三个线程启动，要求如下:
*   AA打印5次，BB打印10次，CC打印15次
*   接着
*   AA打印5次，BB打印10次，CC打印15次
*   。。。来10轮
*/
class ShareResource{
    private int number = 1;  // 1:A  2:B  3:C
    private Lock lock = new ReentrantLock();
    private Condition condition1 = lock.newCondition();
    private Condition condition2 = lock.newCondition();
    private Condition condition3 = lock.newCondition();

    public void print5(){
        lock.lock();
         try {
             //1.判断
            while (number!=1){
                condition1.await();
            }
            //2.干活
             for (int i = 0; i < 5; i++) {
                 System.out.println(Thread.currentThread().getName()+"--"+i);
             }
            //3.通知
             number = 2;
            condition2.signal();
          }catch (Exception e){
             e.printStackTrace();
          }finally {
             lock.unlock();
         }
    }
    public void print10(){
        lock.lock();
        try {
            //1.判断
            while (number!=2){
                condition2.await();
            }
            //2.干活
            for (int i = 0; i < 10; i++) {
                System.out.println(Thread.currentThread().getName()+"--"+i);
            }
            //3.通知
            number = 3;
            condition3.signal();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
    public void print15(){
        lock.lock();
        try {
            //1.判断
            while (number!=3){
                condition3.await();
            }
            //2.干活
            for (int i = 0; i < 15; i++) {
                System.out.println(Thread.currentThread().getName()+"--"+i);
            }
            //3.通知
            number = 1;
            condition1.signal();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
}

public class ThreadOrderAccess {
    public static void main(String[] args) {
        ShareResource shareResource = new ShareResource();

         new Thread(()->{
             for (int i = 0; i < 10; i++) {
                 shareResource.print5();
             }
         },"A").start();

        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                shareResource.print10();
            }
        },"B").start();

        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                shareResource.print15();
            }
        },"C").start();

    }
}
